Why Wi-Fi isn't working: A complete breakdown of the causes and solutions

You're sitting on the couch with your laptop, trying to open your favorite website—and instead, you see the message "No Internet Access" or a never-ending loading bar. Or even worse: your smartphone stubbornly refuses to connect to your home network, even though everything worked perfectly yesterday. Sound familiar? Having trouble with Wi-Fi — one of the most common technical headaches faced by every second user. While wired internet usually fails predictably (a frayed cable, a broken port), wireless networks are much more complex: there can be dozens of causes, and the symptoms are often the same.

In this article we will not just list the possible reasons why Wi-Fi may not work, but we'll take them apart logical blocksFrom basic checks (which you've probably already done) to in-depth hardware diagnostics, you'll learn how to distinguish a hardware failure from a software one, why a simple reboot sometimes helps, and sometimes a hardware replacement is necessary. And most importantly, what actions to take. should never be undertaken unless absolutely necessary (Spoiler: resetting your router to factory settings often only makes the problem worse.)

Before we dive into the details, answer one question: did the problem occur? on one device only (for example, the phone does not connect, but the laptop works) or on all at once (All gadgets have lost connection)? This is a key point that will immediately narrow down the possible culprits.

1. Problems with the Internet source (ISP)

The first thing to rule out is no internet from the providerYes, it sounds trivial, but about 30% of support requests are related to this very issue. Providers rarely notify about scheduled maintenance in advance (especially small regional companies), and line failures happen regularly. How can you check?

The most reliable method is to connect the cable directly to your computer or laptop, bypassing the router. If the internet doesn't work, it's your ISP's fault. Alternative methods:

• 📞 Call support (the number is usually indicated on the contract or on a sticker on the router).
• 🌐 Go to your provider's website from your mobile internet and check the "Service Status" or "News" section.
• 📱 Use the provider's official app (at Rostelecom, Beeline, MTS and other major operators have mobile applications with information about malfunctions).

If your provider has confirmed that everything is fine on their end, but the cable internet still doesn't work, the problem may lie in:

• 🔌 Damaged cable (rubbed over, bent over, bitten by rodents - yes, this happens!).
• 🖥️ Faulty network adapter on the computer.
• 🔄 Connection settings failure (for example, it is written incorrectly IP or DNS).

⚠️ Attention: If you have GPON- connection (fiber optic), check if the indicator is on PON or LOS On your router. If it's blinking red or not lit at all, there's a problem with the line to your home. Call your provider and demand they send a service team.

2. Router malfunction: from overheating to firmware issues

A router is a mini-computer with its own processor, memory, and operating system. And, like any computer, it can freeze, overheat, or break downLet's consider typical scenarios:

a) Hardware failureIf your router doesn't respond to buttons, won't turn on, or constantly reboots, these are signs of a problem. Common causes include:

• ⚡ Power surge (if the router is not connected via a UPS or power strip).
• 🔥 Overheat (especially relevant for models in a plastic case without ventilation, for example, TP-Link TL-WR841N or D-Link DIR-300).
• 💧 Moisture ingress (even condensation can cause a short circuit).

b) Software failureThe router turns on, the lights are on, but there's no internet connection. Possible causes:

• 🔄 Stuck firmware (for example, after an unsuccessful update).
• 🛡️ Blocking by MAC-address (if the filter is enabled in the settings).
• 📡 Channel conflict (if the neighboring router operates on the same channel and creates interference).

If the router turns on, but behaves erratically (sometimes it works, sometimes it doesn't), try the following steps:

Turn off the power for 30 seconds, then turn it on again|

Check the case temperature (it should be warm, but not hot)|

Connect to the router via cable and go to the web interface (192.168.0.1 or 192.168.1.1)|

Update firmware via the manufacturer's official website|

Reset settings with the button Reset (hold for 10-15 seconds)-->

⚠️ Attention: Do not update your router firmware through Wi-Fi! Use a wired connection only. An interrupted update can brick your device.

3. Problems on the client device side

If The internet is available on other devices, but it doesn't work on one. (for example, only on a smartphone or laptop), that device is the culprit. Let's look at typical causes:

a) Incorrect network settingsOften users manually enter IP, DNS or gateway, and then forget about it. How to check:

• 📱 On Android: go to Settings → Wi-Fi → [your network] → IP settings and select DHCP (automatic receipt).
• 🍎 On iPhone: Settings → Wi-Fi → (i) next to network → Configure DNS → Automatic.
• 💻 On Windows: V Control Panel → Network Connections → IPv4 Properties check the boxes for automatic receipt IP And DNS.

b) Network adapter failureSometimes the Wi-Fi module driver crashes after a system update or due to viruses. Symptoms:

• 🖥️ In the device manager, there is an exclamation mark next to the adapter.
• 🔍 The network is visible, but does not connect with the error "Failed to obtain an IP address."
• 🔄 Wi-Fi periodically turns off and on by itself.

Solutions:

• 🔄 Restart your device (yes, sometimes this helps!).
• 🔧 Update adapter driver via device Manager.
• 🗑️ Delete the driver and reinstall it (download it from the laptop or adapter manufacturer's website).
• 🛡️ Check your system for viruses (some malware blocks network connections).

4. Interference and signal problems

You'll be surprised, but often Wi-Fi isn't working because of interference, not because it's broken.Wireless networks operate in a limited frequency range (2.4 GHz and 5 GHz), and if there are too many devices nearby, they begin to "jam" each other. Typical sources of interference:

• 📡 Neighboring Wi-Fi networks (especially if they work on the same channel).
• 📱 Smart devices (Bluetooth-speakers, wireless headphones, smart bulbs).
• 🔌 Household appliances (microwaves, cordless telephones, wireless cameras).
• 🚗 Car alarms (operate on frequency 433 MHz, but may create background noise).

How to check the interference level?

• 📊 Use apps like Wi-Fi Analyzer (For Android) or NetSpot (For macOS/Windows). They will show which channels are busy and how loaded the network is.
• 🔍 In the router's web interface (192.168.0.1) find the section Wireless or Wi-Fi and see which channel is selected. If it is Auto - try manually specifying the least loaded one (for example, 1, 6 or 11 for 2.4 GHz).

If the signal is weak or keeps dropping out, try:

• 📍 Move the router to the center of the apartment (preferably on a higher level).
• 🔄 Change range from 2.4 GHz by 5 GHz (if your router supports it). The latter is less susceptible to interference, but has poorer penetration through walls.
• 🛡️ Install a repeater (Wi-Fi repeater) or a mesh system (for example, TP-Link Deco or Keenetic).

Why might 5GHz perform worse than 2.4GHz?

The 5 GHz band offers higher speeds, but has a shorter range and is less able to penetrate obstacles (walls, furniture). If your router is in one room and you're connecting from another room through two or three walls, the 5 GHz signal may simply not reach you. In this case, it's best to stick with 2.4 GHz or use combined mode (both networks simultaneously).

5. MAC address blocking or parental control

Many users don't even realize that their router can block devices by MAC- address or restrict access according to a schedule. If Wi-Fi suddenly stops working on one device, check:

a) Filter by MAC-addressSome routers (for example, ASUS RT-AC66U or Keenetic) allow you to manually specify which devices are allowed to connect. If your MAC If your account is not on the "white list," access will be blocked. How to check:

1. Go to the router's web interface (192.168.0.1 or 192.168.1.1).
2. Find the section Wireless → MAC Filter (or similar).
3. If the filter is enabled, add MAC-your device's address or disable filtering.

b) Parental controlPerhaps someone (or you) has set up a time limit. For example, Wi-Fi turns off after 11:00 PM or only works for 2 hours a day. Check the section Parental Control or Access Control.

c) Guest networkIf you're connected to a guest network, it may have some limitations (for example, no access to local devices or limited speed). Try connecting to the main network.

⚠️ Attention: Some providers (eg Rostelecom or Beeline) block access to router settings if it's rented. In this case, you'll have to call support and ask them to disable filtering.

6. Incorrect security settings

Errors in security settings are one of the most common reasons why devices won't connect to Wi-FiMost often, problems arise due to:

• 🔑 Incorrect password (you changed it, but forgot to update it on your device).
• 🔒 Incompatible encryption type (for example, the router is configured to WPA3, and the old device only supports WPA2).
• 📜 Hidden network (Hidden SSID) - If the network does not broadcast its name, it is more difficult to connect to it.

How to check security settings:

1. Go to the router's web interface (192.168.0.1).
2. Find the section Wireless Security or Wireless security.
3. Make sure that:
• Security type - WPA2-PSK (the most compatible option).
• The password is entered correctly (check the case!).
• Network is not hidden (optional) Hide SSID or Hide network should be disabled).

If you recently changed your password but your device still won't connect, try:

• 🔄 Reboot the device and router.
• 🗑️ Delete the network from those saved on your device and reconnect.
• 🔧 On routers ASUS And TP-Link Sometimes changing the region in the Wi-Fi settings helps (set Russia or Europe).

7. Problems with IP addresses and DHCP

If your device connects to Wi-Fi, but the internet doesn't work (there's an exclamation mark or the message "No internet access"), the problem may be conflict IP-addresses or failure DHCP-servers. Let's consider both cases.

a) IP address conflictThis happens when two devices on the network receive the same IPSymptoms:

• 🖥️ One of the devices suddenly loses connection.
• 🔄 After rebooting the router, the problem disappears (but may return).
• 📱 A notification "IP address conflict" appears on my smartphone.

Solution:

• 🔄 Reboot your router - this will reset all issued IP.
• 🔧 Find the section in your router settings DHCP and check that the address range does not overlap with static ones IP (for example, if the router distributes addresses with 192.168.0.100 By 192.168.0.200, and you manually registered the device 192.168.0.150).
• 🖥️ Set automatic receiving on the problematic device IP.

b) DHCP server failureIf the router does not issue IP- addresses in general, devices will connect to the network, but the internet will not work. Signs:

• 📱 On a smartphone or laptop IP-address starts with 169.254.x.x (this means that DHCP (didn't work).
• 🖥️ The connection status says "Self-assigned IP".

Solution:

• 🔄 Reboot your router.
• 🔧 In the settings DHCP Check that the server is enabled and the address range is not exhausted (for example, if you have 50 devices and the range is 192.168.0.100 By 192.168.0.150).
• 🛡️ Update your router firmware - sometimes there are bugs in DHCP are corrected in new versions.

8. When it's time to take your router in for repair (or buy a new one)

If you've tried all of the above and your Wi-Fi still isn't working, the problem might be hardware failure of the routerHere are some signs that your device needs repair or replacement:

• 🔌 The router does not turn on at all (the indicators do not light, the power button does not respond).
• 🔥 The case gets very hot even after rebooting.
• 📡 Wi-Fi turns on, but the signal disappears after 5-10 minutes (typical for a burned-out radio module).
• 🔄 The router constantly reboots (all indicators blink cyclically).
• 📦 There are visible traces of melting or burning on the case (usually near the power connector).

What can be done:

• 🔧 If your router is under warranty, take it to a service center.
• 💰 If the warranty has expired, estimate the cost of repairs. Sometimes it is cheaper to buy a new one (for example, a simple one) TP-Link TL-WR841N costs ~1500 ₽, and repairs will cost 1000-1200 ₽).
• 🔄 Before purchasing a new router, check if it supports your connection type (PPPoE, DHCP, L2TP) and internet speed (for example, for the 500 tariff Mbps (You need a router with gigabit ports).

⚠️ Attention: If you rented your router from your provider, don't attempt to repair it yourself! This could result in a fine for equipment damage. Contact support—they'll replace it free of charge.

FAQ: Frequently asked questions about Wi-Fi not working

Why does Wi-Fi work on my phone but not on my laptop?

This is a typical situation where the problem is on the client device (laptop). Possible causes include:

• 🔧 Driver failure Wi-Fi-adapter (try updating or reinstalling it).
• 📡 The laptop is connected to a hidden network and the password has changed.
• 🛡️ The router has a filter enabled MAC-address, and the laptop's address is not on the "white list".
• 📶 It's manually registered on the laptop IP or DNS, which conflicts with the network.

The first thing to do is remove network from saved and reconnect. If that doesn't help, check your adapter and router settings.

My Wi-Fi is connected, but the pages won't open. What should I do?

This problem is usually related to settings DNS or IP. Try:

1. 🔄 Reboot your router and device.
2. 📱 Install on your device DNS from Google (8.8.8.8 And 8.8.4.4) or Cloudflare (1.1.1.1).
3. 🖥️ Check if it is enabled on your device VPN or proxies (they may block access).
4. 🛡️ Disable it in your router settings Parental Control And Firewall (temporary solution for testing).

If all else fails, your ISP may be blocking access. Call support.

After resetting my router, my Wi-Fi stopped working. Why?

Factory reset (Reset) erases all settings, including:

• 📡 Network name (SSID) and password.
• 🔌 Internet connection type (PPPoE, DHCP etc.).
• 🛡️ Security settings (WPA2, MAC-filter).

After resetting, the router will not provide internet access until you configure it again. To do this:

1. Connect to the router via cable.
2. Go to the web interface (192.168.0.1 or 192.168.1.1).
3. Enter your provider data (login/password for PPPoE, if required).
4. Set up Wi-Fi (network name, password, encryption type).

If you're unsure about the settings, call your provider; they'll help you find the right settings for your plan.

Can antivirus block Wi-Fi?

Yes, some antiviruses (for example, Kaspersky, ESET NOD32, Avast) have a built-in firewall, which can block connections. Other possible culprits include:

• 🛡️ Windows Firewall (sometimes blocks new networks).
• 🔍 VPN clients (For example, NordVPN or ProtonVPN can redirect all traffic through their servers).
• 📦 Specialized programs like GlassWire or NetLimiter, which control traffic.

To check if your antivirus is to blame:

1. Temporarily disable your antivirus and firewall.
2. Try connecting to Wi-Fi again.
3. If it works, add the network to your antivirus exceptions.

How do you know if your router is burned out?

Signs hardware failure router:

• 🔌 Doesn't turn on at all (no indicators light up, even after changing the power supply).
• 🔥 The case gets very hot (you can get burned).
• 💨 Burning smell or melted plastic near the connectors.
• 📡 Wi-Fi turns on, but the signal disappears after a few